Most cars are manufactured with an installed air conditioning unit. Air conditioning units fall in one of two categories: integral air conditioning compressors or hang-on air conditioning compressors.
An integral air conditioning unit is one that was installed in the factory where the vehicle was manufactured. A hang-on air conditioning system is an aftermarket system installed by a car dealer.
Installing a hang-on air conditioner gives you more options than what the car manufacturer has approved, putting the control over your car's air conditioning system in your hands.
After a car leaves the factory, it can no longer have an integral air conditioning system installed. Once the car's manufacture is complete, the only replacement option is a hang-on air conditioning system.
